| Ostrow Mazowiecka to Bistrita | 408.15 mi (656.86 km) |
| Ostrow Mazowiecka to Blaj | 466.52 mi (750.79 km) |
| Ostrow Mazowiecka to Bocsa | 513.11 mi (825.77 km) |
| Ostrow Mazowiecka to Boldesti-Scaeni | 568.42 mi (914.79 km) |
| Ostrow Mazowiecka to Bolintin Vale | 603.18 mi (970.73 km) |
| Ostrow Mazowiecka to Borsa | 375.79 mi (604.77 km) |
| Ostrow Mazowiecka to Botosani | 407.43 mi (655.70 km) |
| Ostrow Mazowiecka to Brad | 462.61 mi (744.50 km) |
| Ostrow Mazowiecka to Bragadiru | 611.20 mi (983.63 km) |
| Ostrow Mazowiecka to Braila | 587.75 mi (945.89 km) |
| Ostrow Mazowiecka to Brasov | 520.43 mi (837.55 km) |
| Ostrow Mazowiecka to Breaza | 552.76 mi (889.58 km) |
| Ostrow Mazowiecka to Bucharest | 608.92 mi (979.97 km) |
| Ostrow Mazowiecka to Buftea | 597.65 mi (961.82 km) |
| Ostrow Mazowiecka to Buhusi | 471.71 mi (759.14 km) |
